Transcript Continued - AAA Geography

Physical Geography of Southwest Asia:
Harsh and Arid Lands
Southwest Asia’s land is mostly arid or desert. The
region is defined by the resource it lacks—water,
and the one it has in abundance—oil.
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Physical Geography of Southwest Asia:
Harsh and Arid Lands
SECTION 1
Landforms and Resources
SECTION 2
Climate and Vegetation
SECTION 3
Human-Environment Interaction
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Section 1
Landforms and
Resources
• The Southwest Asian landforms have had a
major impact on movement in the region.
• The most valuable resources in Southwest
Asia are oil and water.
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SECTION
1
Landforms and Resources
Landforms Divide the Region
Shifting Plates
• Southwest Asia forms a land bridge between Asia,
Africa, Europe
• Region is at edge of a huge tectonic plate
- parts of Arabian Peninsula are pulling away from
Africa
- parts of Anatolian Peninsula are sliding past parts
of Asia
- other plates are pushing up mountains in other
parts of Asia
Continued . . .
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SECTION
1
continued Landforms
Divide the Region
Peninsulas and Waterways
• Arabian Peninsula lies between Red Sea and
Persian Gulf
• Red Sea covers a rift valley created by Arabian
plate movement
• Zagros, Elburz, Taurus mountains at north side cut
off part of region
• Anatolian Peninsula (Turkey) is between Black and
Mediterranean seas
• Strategic waterways include Suez Canal from Red
Sea to Mediterranean
- Bosporus and Dardenelles straits connect to
Russia, Asia
Continued . . .
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continued Landforms
Divide the Region
Plains and Highlands
• Arabian Peninsula is covered by dry, sandy, windy
plains
- wadis—riverbeds that are dry except in rainy
season
• Iran has stony, salty, sandy desert plateau
surrounded by mountains
• Anatolian Peninsula is plateau with some
agriculture, grazing
• Afghanistan’s Northern Plain is farming area
surrounded by mountains
• Golan Heights (Al Jawlan)—plateau near Jordan
River, Sea of Galilee
- site of conflict due to strategic location
Continued . . .
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continued Landforms
Divide the Region
Mountains
• Afghanistan’s Hindu Kush Mountains help frame
southern Asia
- country is isolated by its landlocked, mountainous
terrain
• Iran’s Zagros Mountains isolate it from rest of
Southwest Asia
- Elburz Mountains cut Iran off from the Caspian
Sea
• Taurus Mountains separate Turkey from rest of
Southwest Asia
• Goods, people, ideas move through region in spite
of mountains
Continued . . .
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SECTION
1
continued Landforms
Divide the Region
Water Bodies
• Region is surrounded by bodies of water; few rivers
flow all year
• The Tigris and the Euphrates rivers flow through
Turkey, Syria, Iraq
- Fertile Crescent supported several ancient
civilizations
- parallel rivers meet at Shatt al Arab, empty into
Persian Gulf
• Jordan River flows from Lebanon’s Mt. Hermon
between Israel, Jordan
• Empties into Dead Sea—landlocked salt lake that
only bacteria live in
- lowest place on earth’s exposed crust: 1,349 feet
below sea level
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SECTION
1
Resources for a Modern World
An Oil-Rich Region
• Oil is region’s most abundant resource
- oil fields located in Arabian Peninsula, Iran, Iraq
- provide major part of those nations’ income
• Half of the world’s oil reserves are in Southwest Asia
- found along Persian Gulf coast or at offshore sites
• U.S. and many other countries depend on oil
reserves
Continued . . .
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SECTION
1
continued Resources
for a Modern World
Other Resources
• In some parts of region, the most valuable resource
is water
• Water is relatively plentiful in Turkey, Iran, Lebanon,
Afghanistan
- harnessed for hydroelectric power
• In other regions, water is scarce; must be guarded,
conserved
• Coal, copper, potash, phosphate deposits mostly
small, scattered
- Iran, Turkey have large coal deposits
- salts like calcium chloride around Dead Sea have
not been developed
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Section 2
Climate and Vegetation
• Most of Southwest Asia has a very arid
climate.
• Irrigation is critical to growing crops in this
very dry region.
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2
Climate and Vegetation
Variety in Arid Lands
Mostly Dry and Desert, but Some Green
• Most areas get less than 18 inches of precipitation a
year
• Rough, dry terrain includes sand dunes, salt flats
• Rivers don’t flow all year; plants, animals live on little
water
- in many areas irrigation turns desert into farmland
• Other areas have Mediterranean climate; green, lush
part of each year
• Mountain ranges and plateaus have highland
climates
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2
Deserts Limit Movement
Sandy Deserts
• Rub al-Khali—Arabian Peninsula desert, known as
the Empty Quarter
- 250,000 square miles, with dunes as high as 800
feet
- 10 years can pass without rain
• Nearby An-Nafud Desert contains the occasional
oasis
- desert area where underground spring water
supports vegetation
• Syrian Desert is between Lebanon, Israel, Syria, and
Fertile Crescent
• Israel’s Negev Desert produces crops through
irrigation
Continued . . .
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continued Deserts
Limit Movement
Salt Deserts
• In Iran, high mountains block rain; dry winds increase
evaporation
- loss of moisture in soil leaves chemical salts,
creates salt flat
• Iran’s salt flat deserts:
- Dasht-e Kavir in central Iran
- Dasht-e Lut in eastern Iran
• Land is salt-crusted, surrounded by salt marshes,
very hot
- almost uninhabited, it’s a barrier to easy travel
across Iran
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Semi-Arid Lands
The Edge of the Desert
• Fringes of deserts have semiarid climate
• Warm to hot summers; enough rainfall for grasses,
shrubs
- cotton and wheat can be grown
• Good pasture for animals
- herds of mohair goats raised in Turkey
- mohair hair and fabrics from it are among Turkey’s
exports
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Well-Watered Coast Lands
The Mediterranean Coast
• Areas along Mediterranean coast and in Turkey
have adequate rainfall
- hot summers, rainy winters promote citrus fruits,
olives, vegetables
• Mild winters and summer irrigation let farmers grow
crops all year
• Areas are heavily populated due to comfortable
climate
The Tigris and Euphrates
• River valleys the site of intensive farming for
thousands of years
- Turkey, Iraq built dams on rivers to provide
irrigation all year
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Section 3
Human-Environment
Interaction
• Water is critical to regional physical survival
and economic development.
• Discovery of oil increased the global
economic importance of Southwest Asia.
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SECTION
3
Human-Environment Interaction
Providing Precious Water
Dams and Irrigation Systems
• Large farms and growing populations require dams,
irrigation
- Turkey is building dams and a man-made lake on
upper Euphrates
- controversial project will deprive downstream
countries of water
• Israel’s National Water Carrier project
- takes water from northern areas
- carries it to central, south, Negev Desert
- water flows through several countries so project
creating conflict
Continued . . .
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continued Providing
Precious Water
Modern Water Technology
• Drip irrigation—small pipes slowly drip water just
above ground
• Desalinization removes salt from ocean water at
treatment plants
- plants are expensive, cannot provide enough water
• Wastewater can be treated and used for agriculture
• Fossil water is pumped from underground aquifers
- water has been in aquifer for long periods of time
- rainfall won’t refill aquifers; only 25–30 years of
usage remain
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SECTION
3
Oil From the Sand
Forming Petroleum
• Oil, natural gas deposits formed millions of years
ago
- sea covered area; remains of plants, animals
mingled in sand, mud
- pressure and heat slowly transformed material
into hydrocarbons
• Oil, gas are not in underground pools, but in the tiny
pores of rocks
- nonporous rock barriers trap gas, oil below
surface
- makes oil difficult to find, remove
- wasn’t found in region until 1920–30s
Continued . . .
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continued Oil
From the Sand
Early Exploration
• Industrialization, automobiles increase need for
petroleum
• First oil discovery in region was in 1908 in Persia
(now Iran)
- more oil fields found in Arabian Peninsula, Persian
Gulf in 1938
• In 1948, al-Ghawar field discovered at eastern edge
of Rub al-Khali
- became one of world’s largest oil fields
- contains one-quarter of Saudi Arabia’s oil reserves
Continued . . .
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continued Oil
From the Sand
Transporting Oil
• Crude oil is petroleum that has not been processed
- refinery converts crude oil into useful products
• Pipelines move crude oil to refineries, ports
- ports on Persian Gulf, Red Sea, Mediterranean Sea
- tankers carry petroleum to world markets
• In some places refineries process crude oil near ports
Continued . . .
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SECTION
3
continued Oil
From the Sand
Risks of Transporting Oil
• Largest oil spill was in January 1991, during Persian
Gulf War
- Kuwaiti tankers, oil storage tanks were blown up
- 240 million gallons of crude oil spilled into water,
land
• Buried pipelines reduce accidents; are monitored for
leaks
• Tankers are a high pollution risk; operate in shallow,
narrow waters
- double hulls help prevent some spills
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